1 /* 2 * qemu user cpu loop 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "qemu.h" 23 #include "user-internals.h" 24 #include "cpu_loop-common.h" 25 #include "signal-common.h" 26 #include "internal.h" 27 28 void cpu_loop(CPUHexagonState *env) 29 { 30 CPUState *cs = env_cpu(env); 31 int trapnr; 32 target_ulong syscallnum; 33 target_ulong ret; 34 35 for (;;) { 36 cpu_exec_start(cs); 37 trapnr = cpu_exec(cs); 38 cpu_exec_end(cs); 39 process_queued_cpu_work(cs); 40 41 switch (trapnr) { 42 case EXCP_INTERRUPT: 43 /* just indicate that signals should be handled asap */ 44 break; 45 case HEX_EXCP_TRAP0: 46 syscallnum = env->gpr[6]; 47 env->gpr[HEX_REG_PC] += 4; 48 ret = do_syscall(env, 49 syscallnum, 50 env->gpr[0], 51 env->gpr[1], 52 env->gpr[2], 53 env->gpr[3], 54 env->gpr[4], 55 env->gpr[5], 56 0, 0); 57 if (ret == -QEMU_ERESTARTSYS) { 58 env->gpr[HEX_REG_PC] -= 4; 59 } else if (ret != -QEMU_ESIGRETURN) { 60 env->gpr[0] = ret; 61 } 62 break; 63 case EXCP_ATOMIC: 64 cpu_exec_step_atomic(cs); 65 break; 66 case EXCP_DEBUG: 67 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, 0); 68 break; 69 default: 70 EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n", 71 trapnr); 72 exit(EXIT_FAILURE); 73 } 74 process_pending_signals(env); 75 } 76 } 77 78 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 79 { 80 env->gpr[HEX_REG_PC] = regs->sepc; 81 env->gpr[HEX_REG_SP] = regs->sp; 82 env->gpr[HEX_REG_USR] = 0x56000; 83 } 84